Stay Cool Under Any Helmet or Head Gear with This Cooling Helmet Liner – Perfect for Sports, Work, or Outdoor Adventure

Stay cool, dry, and protected.

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Whether you’re biking through city streets, grinding it out on a job site, or sprinting across a scorching field, heat stress is real—and exhausting. The MISSION Cooling Helmet Liner is your personal temperature regulator, engineered for comfort and built for performance.

With HydroActive™ technology, this ultra-light liner cools to 30° below average body temperature in under a minute and keeps going for up to 2 hours. Just wet it, wring it, wave it—and wear it. It fits snugly under helmets without bunching or bulk, and its UPF 50 fabric offers all-day sun protection, too.

Perfect for athletes, workers, riders, and adventurers, this liner is also odor-resistant, machine washable, and compact enough to fit in your pocket. It’s the small upgrade that makes a big difference when the heat is on.

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Why It’s a Must-Have:

Instant Cooling Relief: Activates with water or sweat for up to 2 hours of chill
Ultra-Light Comfort: Breathable mesh crown won’t add heat or bulk
Sun Smart: UPF 50 protection guards your scalp from harmful UV rays
Odor-Free & Washable: Machine washable for freshness after every use
Universal Fit: Unisex, stretch-fit design works under any helmet
Pocket-Size Power: Compact enough to stash in your back pocket or gear bag

Whether you’re out grinding pavement or laying pipe in the midday sun, this liner keeps you cool, focused, and fully protected—without missing a beat.

Pro Tip: Carry a second liner and swap halfway through for nonstop cooling power on marathon days.

Promising Customers Review: “, I’ve got a big head, and these are extremely comfortable! They’re not too loose, they’re not too tight. I don’t even bother to take it off, while taking breaks.  It keeps me cool, and, keeps the sweat out of my eyes. These really are good for at least 12 hour days. Out of 5 stars, they truly take all 5!!!” – Enigma

“This helmet liner is perfect for practically any helmet to help keep you cool. It fits nicely under my bike helmet as well as my airsoft helmet. I also found it extremely useful for VR headsets, as they can get pretty uncomfortable when you start to sweat. A very good product and I definitely recommend it.” – Scotty Do

“My daughter has started bmx racing and in this heat she was miserable. So thankful I found this because she says it definitely helps a lot. I noticed a difference in the redness in her face. Doesn’t effect her helmet at all.” –
James Van Bibber

“Keeping my head nice and cool for football practice and games…” – Jim

Reviews have been edited for length and/or clarity.

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